The Panasonic BAT-LR03/P-B4 is a rechargeable lithium ion battery designed for use in digital cameras, gaming devices, and other electronic products. It is a 3.7V, 800mAh, 8.93Wh battery that can be recharged up to 500 times. The battery comes with a positive and negative contact, and a four-pin mini-USB connector. It features a long-life design, and a low-self discharge rate, allowing it to hold a charge for long periods without needing to be recharged. The battery is compatible with a wide range of Panasonic digital cameras, as well as various gaming devices and other consumer electronics products.